This fixes the error

In file included from gthr-default.h:1,
                 from /build/arm-unknown-linux-gnu/gcc-2.95.3-glibc-2.2.2/gcc-2.95.3/gcc/gthr.h:98,
                 from /build/arm-unknown-linux-gnu/gcc-2.95.3-glibc-2.2.2/gcc-2.95.3/gcc/libgcc2.c:3034:
/build/arm-unknown-linux-gnu/gcc-2.95.3-glibc-2.2.2/gcc-2.95.3/gcc/gthr-posix.h:37: pthread.h: No such file or directory
make[3]: *** [libgcc2.a] Error 1
make[3]: Leaving directory `/build/arm-unknown-linux-gnu/gcc-2.95.3-glibc-2.2.2/build-gcc-core/gcc'

in what I think is a nicer way than the patch used by the arm team,
i.e. "perl -pi -e 's/^(TARGET_LIBGCC2_CFLAGS.*)/$1 -Dinhibit_libc -D__gthr_posix_h/' gcc/config/arm/t-linux"
which seems a bit of a kludge.

--- gcc-2.95.3/gcc/configure.old	Fri Mar 16 06:13:48 2001
+++ gcc-2.95.3/gcc/configure	Sun Jun  8 13:02:20 2003
@@ -853,9 +853,9 @@
 # Check whether --enable-threads or --disable-threads was given.
 if test "${enable_threads+set}" = set; then
   enableval="$enable_threads"
-  if test x$enable_threads = xno; then
-	enable_threads=''
-fi
+  #if test x$enable_threads = xno; then
+	#enable_threads=''
+  #fi
 else
   enable_threads=''
 fi